JPH057322Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to construction machinery, and more specifically, to an improved undercarriage of a construction machine having an improved means for aligning an upper revolving structure and a turning circle. .

[Conventional technology]

In a lower traveling body of a construction machine such as a hydraulic excavator, a swing wheel and an upper rotating body are bolted together. The connection is carried out by hoisting the upper revolving body equipped with the equipment, excluding the front attachment, with a crane.
This is done by lowering the upper revolving body while aligning the screw hole of the upper revolving body with the through hole of the turning ring of the turning circle, and fastening them together with bolts.

[Problem that the invention attempts to solve]

When the upper revolving body and the revolving ring are connected, the screw hole and the through hole of the revolving ring are aligned with each other by a dowel pin attached to the revolving ring.
However, the dowel pin and its insertion hole require considerable machining precision, and not only does the dowel pin insertion hole require reaming, but the upper revolving body itself is large, requiring considerable machining cost. .

The present invention can perform the work of connecting the swing wheel and the upper swing structure at a lower cost.
The present invention provides an improved undercarriage for construction machinery.

[Means for solving problems]

The undercarriage body of the present invention has a threaded portion and a conical portion at both ends, and the threaded portion is connected to the screw hole in order to align the screw hole and the through hole with respect to the bolt when connecting the upper revolving structure and the undercarriage body. In addition to being screwed in, the conical part is fitted into the through hole and the positioning pin is used to make the connection possible without using a dowel pin, thus solving the processing problems caused by the dowel pin. It is something.

Embodiments of the undercarriage for construction machinery of the present invention will be described below with reference to the accompanying drawings.

〔Example〕

FIG. 3 shows a hydraulic excavator with this lower running body. The lower traveling body consists of a traveling mechanism 10 and a swing wheel 11 bolted to the traveling mechanism 10, and an upper rotating body 12 is installed thereon. engine,
The front attachment, house, etc. are mounted on the upper revolving body, and the upper revolving body is bolted to the swing wheel 11 and can rotate about a vertical axis.

The turning circle itself comprises an outer ring 13 and an inner ring 14, as shown in FIG. These swivel wheels have the form of rings. Inner ring 14 is inserted into outer ring 13. Annular grooves are provided in the outer peripheral surface of the inner ring 14 and the inner peripheral surface of the outer ring 13, and a number of balls 15 are inserted into the annular spaces formed by these grooves. A large turning gear 16 is provided on the inner peripheral surface of the inner ring 14. Although not shown, a small turning gear is meshed with the gear 16, and the small gear is attached to the output shaft of a motor unit installed on the upper revolving body 12. In this turning ring, an inner ring 14 is fixed by bolts 18 to a shallow cylindrical member 17 that constitutes a part of the traveling mechanism.

The upper revolving body 12 has a disk-like shape,
It is placed on the outer ring 13 of the turning ring and is fastened with bolts. The upper revolving body 12 and the outer ring 13 of the revolving ring 11 are connected to each other by hoisting the upper revolving body 12 without the shovel attachment with a crane and aligning the two, as in the conventional method. Meanwhile, the upper revolving body 1
2 is lowered and fastened with bolts.

In this lower traveling body, positioning is performed by alignment pins provided on the upper revolving body 12. The alignment pin is designated by reference numeral 21 in the drawings. The pin itself has at one end a threaded portion 23 associated with a threaded hole 22 for a bolt connecting the upper rotating body 12 with the turning ring 13 of the turning circle, and a conically shaped portion 24 at the other end. It is provided.

Prior to aligning the upper revolving body 12 and the outer ring 13 of the revolving ring, the positioning pin causes the conical portion 24 to protrude from the upper revolving body 12 and inserts the threaded portion 23 into the screw hole 22 of the upper revolving body 12. Screwed in. When the upper revolving body 12 is positioned above the outer ring 13 and lowered as described above, the positioning pin 21 has the tip of the conical portion 24 aligned with the revolving ring 13.
The positioning pin 21 can be easily fitted into the through hole 25 as a guide for the through hole 25 in the upper rotating body, and all of the screw holes 22 in the upper rotating body and the through hole 25 in the turning ring can be easily fitted together. All of the above can be located. In this way, the alignment is done using the screw holes 2 that originally exist in the upper rotating body.
This is done by the positioning pin 21 attached to the upper rotating body 12, and the machining of the knock pin and its guide, which was essential in the conventional lower traveling body, can be made unnecessary, so the machining cost of the upper rotating body 12 can be reduced. can be lowered.

Furthermore, the positioning pin 21 is connected to the upper rotating body 12.
The part protruding from the upper revolving body is provided with means for connecting with a tool for removing it from the upper revolving body, for example, a threaded hole 22 and a reverse threaded screw hole 26, so that the upper revolving body and the revolving ring 13 are connected to each other as described above. After the bolts are fastened as shown in the figure, a tool is inserted into the through hole 25 of the swivel ring, and the screw hole 26 of the positioning pin 21 is inserted.
, rotate the tool, remove the screw 22 part of the positioning pin 21 from the screw hole 23 , pull out the tool together with the positioning pin 21 , and then screw the fastening bolt into the screw hole 23 . Therefore, the upper revolving body 12 and the outer ring 13 can be all connected by bolts.

FIG. 2 shows another embodiment of the undercarriage according to the present invention. Here, only the structure for attaching the positioning pin to the upper revolving body differs from the previous embodiment. Among the bolt holes in the upper revolving body 12, the bolt hole 122 to which the positioning pin is attached is a blank hole. At the same time, the opposite side of the conical portion 124 of the alignment pin 123 is longer than the thickness of the upper revolving body 12, and the threaded portion 123 is provided at the end thereof. For installation, attach the threaded portion 123 to the upper rotating body 12.
This is done by protruding from the hole 122 of the upper revolving body 12 and inserting the nut 127 into the threaded portion 123.

Although such a positioning pin can also align the upper revolving body 12 and the revolving ring 13 in the same manner as in the above-described embodiment, it is necessary to thread the hole 122 of the upper revolving body for the positioning pin 121. Therefore, the machining cost of the upper revolving body can be reduced compared to the above-mentioned embodiments.

In addition, in the embodiment described above, the upper revolving body has a screw hole and the revolving ring has a through hole, but it will be noted in more detail that the present invention can be applied to an arrangement in which these are reversed. It should be obvious that there is no need to explain it.

[Effect of idea]

As described above, the construction undercarriage of the present invention is constructed by screwing the positioning pin into the threaded hole in one of the revolving wheels of the upper revolving member and the revolving circle, and using this positioning pin to connect the upper revolving member to the upper revolving member. By aligning with the slewing ring, it is possible to eliminate the need for machining the dowel pin and corresponding hole in the conventional slewing ring, so it can be manufactured at a lower cost.

[Brief explanation of the drawing]

1 and 2 show an embodiment of an undercarriage for construction machinery according to the present invention, FIG. 1 is a cross-sectional view of the upper revolving body and the revolving ring, and FIG. 2 is a cross-sectional view of the upper revolving body and the revolving ring. FIG. 3 is a sectional view showing another structure around the swing ring, and a side view showing an example of a hydraulic excavator having these pins. 10... Traveling mechanism, 11... Swivel wheel, 12...
Upper revolving body, 13... Outer ring, 21, 121... Positioning pin, 22, 122... Threaded hole for bolt, 23, 123... Threaded portion, 24, 1
24...Conical portion, 25...Through hole for bolt.

Claims (1)

[Claims for Utility Model Registration] 1. An upper rotating body, a lower traveling body having a swing ring bolted to the upper rotating body, a screw hole for the bolt provided on one of these, and a bolt provided on the other. and a positioning pin disposed between these to determine the relative position with the through hole, the positioning pin having a threaded portion and a conical portion at both ends, and the threaded portion being screwed into the threaded hole. An undercarriage body for construction machinery, characterized in that the conical part is fitted into the through hole. 2 Utility model registration claim No. 2 in which the positioning pin is provided with a means for coupling with a tool for removing the positioning pin from the screw hole on the conical part
The undercarriage described in section.